diff --git a/src/processor/stackwalker_x86.cc b/src/processor/stackwalker_x86.cc
index 2276374a..14824ddf 100644
--- a/src/processor/stackwalker_x86.cc
+++ b/src/processor/stackwalker_x86.cc
@@ -134,7 +134,7 @@ StackFrame* StackwalkerX86::GetCallerFrame(
 
   // Set up the dictionary for the PostfixEvaluator.  %ebp and %esp are used
   // in each program string, and their previous values are known, so set them
-  // here.  .cbCalleeParams is an Breakpad extension that allows us to use
+  // here.  .cbCalleeParams is a Breakpad extension that allows us to use
   // the PostfixEvaluator engine when certain types of debugging information
   // are present without having to write the constants into the program string
   // as literals.
diff --git a/src/tools/mac/crash_report/on_demand_symbol_supplier.h b/src/tools/mac/crash_report/on_demand_symbol_supplier.h
index 22c3c825..cedbebb0 100644
--- a/src/tools/mac/crash_report/on_demand_symbol_supplier.h
+++ b/src/tools/mac/crash_report/on_demand_symbol_supplier.h
@@ -28,7 +28,7 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // on_demand_symbol_supplier.h: Provides a Symbol Supplier that will create
-// an breakpad symbol file on demand.
+// a breakpad symbol file on demand.
 
 #ifndef TOOLS_MAC_CRASH_REPORT_ON_DEMAND_SYMBOL_SUPPLIER_H__
 #define TOOLS_MAC_CRASH_REPORT_ON_DEMAND_SYMBOL_SUPPLIER_H__
diff --git a/src/tools/mac/dump_syms/dump_syms_tool.m b/src/tools/mac/dump_syms/dump_syms_tool.m
index d0a343ab..df455d05 100644
--- a/src/tools/mac/dump_syms/dump_syms_tool.m
+++ b/src/tools/mac/dump_syms/dump_syms_tool.m
@@ -67,7 +67,7 @@ static void Start(Options *options) {
 
 //=============================================================================
 static void Usage(int argc, const char *argv[]) {
-  fprintf(stderr, "Output an Breakpad symbol file from a Mach-o file.\n");
+  fprintf(stderr, "Output a Breakpad symbol file from a Mach-o file.\n");
   fprintf(stderr, "Usage: %s [-a ppc|i386|x86] <Mach-o file>\n",
           argv[0]);
   fprintf(stderr, "\t-a: Architecture type [default: native]\n");