diff --git a/engines/sci/attic/graphics_png.h b/engines/sci/attic/graphics_png.h
index 505adfe8..df4e7706 100644
--- a/engines/sci/attic/graphics_png.h
+++ b/engines/sci/attic/graphics_png.h
@@ -19,7 +19,7 @@
  *
  */
 
-/* Provides facilities for writing pictures and seperate views to .png files */
+/* Provides facilities for writing pictures and separate views to .png files */
 
 
 #ifndef _SCI_GRAPHICS_PNG_H_
diff --git a/engines/scumm/extract_scumm_mac.cpp b/engines/scumm/extract_scumm_mac.cpp
index 29920f4d..d2a38b53 100644
--- a/engines/scumm/extract_scumm_mac.cpp
+++ b/engines/scumm/extract_scumm_mac.cpp
@@ -19,7 +19,7 @@
  *
  */
 
-/* Split one-big-file Macintosh game data into seperate .00x files for ScummVM */
+/* Split one-big-file Macintosh game data into separate .00x files for ScummVM */
 
 #include "extract_scumm_mac.h"
 
diff --git a/example_tool.cpp b/example_tool.cpp
index 753a7a59..d98a6488 100644
--- a/example_tool.cpp
+++ b/example_tool.cpp
@@ -149,7 +149,7 @@ void CompressionExample::execute() {
 		if (_outputFiles) {
 			File out(_outputPath.getPath() + outname.str() + ".exo", "w");
 
-			// What we actually do, output some text alot
+			// What we actually do, output some text a lot
 			for (size_t j = 0; j < 100; ++j) {
 				if (i < in1.size())
 					out.write(text1.c_str(), 1, text1.size());
diff --git a/tool.h b/tool.h
index 2013d23c..e70523c3 100644
--- a/tool.h
+++ b/tool.h
@@ -53,7 +53,7 @@ enum InspectionMatch {
 };
 
 /**
- * Describes a possible input to the tool (since some take two seperate files,
+ * Describes a possible input to the tool (since some take two separate files,
  * some a dir and some a single file.
  */
 struct ToolInput {