diff --git a/cpp/QrCode.cpp b/cpp/QrCode.cpp
index ab6039c..52281f7 100644
--- a/cpp/QrCode.cpp
+++ b/cpp/QrCode.cpp
@@ -119,14 +119,14 @@ QrCode::QrCode(int ver, Ecc ecl, const vector<uint8_t> &dataCodewords, int mask)
 		version(ver),
 		size(MIN_VERSION <= ver && ver <= MAX_VERSION ? ver * 4 + 17 : -1),  // Avoid signed overflow undefined behavior
 		errorCorrectionLevel(ecl),
-		modules   (size, vector<bool>(size)),  // Entirely white grid
+		modules   (size, vector<bool>(size)),  // Initially all white
 		isFunction(size, vector<bool>(size)) {
 	
 	// Check arguments
 	if (ver < MIN_VERSION || ver > MAX_VERSION || mask < -1 || mask > 7)
 		throw std::domain_error("Value out of range");
 	
-	// Draw function patterns, draw all codewords, do masking
+	// Compute ECC, draw modules, do masking
 	drawFunctionPatterns();
 	const vector<uint8_t> allCodewords = addEccAndInterleave(dataCodewords);
 	drawCodewords(allCodewords);
diff --git a/java/io/nayuki/qrcodegen/QrCode.java b/java/io/nayuki/qrcodegen/QrCode.java
index 83f17f7..d89781c 100644
--- a/java/io/nayuki/qrcodegen/QrCode.java
+++ b/java/io/nayuki/qrcodegen/QrCode.java
@@ -222,10 +222,10 @@ public final class QrCode {
 		// Initialize fields
 		version = ver;
 		size = ver * 4 + 17;
-		modules    = new boolean[size][size];  // Entirely white grid
+		modules    = new boolean[size][size];  // Initially all white
 		isFunction = new boolean[size][size];
 		
-		// Draw function patterns, draw all codewords, do masking
+		// Compute ECC, draw modules, do masking
 		drawFunctionPatterns();
 		byte[] allCodewords = addEccAndInterleave(dataCodewords);
 		drawCodewords(allCodewords);
diff --git a/javascript/qrcodegen.js b/javascript/qrcodegen.js
index 5c6835a..25d2d09 100644
--- a/javascript/qrcodegen.js
+++ b/javascript/qrcodegen.js
@@ -83,14 +83,14 @@ var qrcodegen = new function() {
 		var row = [];
 		for (var i = 0; i < size; i++)
 			row.push(false);
-		var modules    = [];
+		var modules    = [];  // Initially all white
 		var isFunction = [];
 		for (var i = 0; i < size; i++) {
 			modules   .push(row.slice());
 			isFunction.push(row.slice());
 		}
 		
-		// Handle grid fields, draw function patterns, draw all codewords
+		// Compute ECC, draw modules
 		drawFunctionPatterns();
 		var allCodewords = addEccAndInterleave(dataCodewords);
 		drawCodewords(allCodewords);
diff --git a/python/qrcodegen.py b/python/qrcodegen.py
index 0313f15..d07a6cf 100644
--- a/python/qrcodegen.py
+++ b/python/qrcodegen.py
@@ -167,11 +167,11 @@ class QrCode(object):
 		
 		# Initialize grids of modules
 		# The modules of this QR Code symbol (False = white, True = black). Immutable after constructor finishes
-		self._modules    = [[False] * self._size for _ in range(self._size)]
+		self._modules    = [[False] * self._size for _ in range(self._size)]  # Initially all white
 		# Indicates function modules that are not subjected to masking. Discarded when constructor finishes
 		self._isfunction = [[False] * self._size for _ in range(self._size)]
 		
-		# Draw function patterns, draw all codewords
+		# Compute ECC, draw modules
 		self._draw_function_patterns()
 		allcodewords = self._add_ecc_and_interleave(datacodewords)
 		self._draw_codewords(allcodewords)
diff --git a/rust/src/lib.rs b/rust/src/lib.rs
index b0d75bd..e8e8525 100644
--- a/rust/src/lib.rs
+++ b/rust/src/lib.rs
@@ -186,11 +186,11 @@ impl QrCode {
 			size: size as i32,
 			mask: Mask::new(0),  // Dummy value
 			errorcorrectionlevel: ecl,
-			modules   : vec![false; size * size],  // Entirely white grid
+			modules   : vec![false; size * size],  // Initially all white
 			isfunction: vec![false; size * size],
 		};
 		
-		// Draw function patterns, draw all codewords, do masking
+		// Compute ECC, draw modules, do masking
 		result.draw_function_patterns();
 		let allcodewords: Vec<u8> = result.add_ecc_and_interleave(datacodewords);
 		result.draw_codewords(&allcodewords);
diff --git a/typescript/qrcodegen.ts b/typescript/qrcodegen.ts
index 52d8cec..dde5e87 100644
--- a/typescript/qrcodegen.ts
+++ b/typescript/qrcodegen.ts
@@ -172,11 +172,11 @@ namespace qrcodegen {
 			for (let i = 0; i < this.size; i++)
 				row.push(false);
 			for (let i = 0; i < this.size; i++) {
-				this.modules   .push(row.slice());
+				this.modules   .push(row.slice());  // Initially all white
 				this.isFunction.push(row.slice());
 			}
 			
-			// Handle grid fields, draw function patterns, draw all codewords
+			// Compute ECC, draw modules
 			this.drawFunctionPatterns();
 			let allCodewords: Array<byte> = this.addEccAndInterleave(dataCodewords);
 			this.drawCodewords(allCodewords);