diff --git a/src/input.cpp b/src/input.cpp
index 6a635fffb9..1486923622 100644
--- a/src/input.cpp
+++ b/src/input.cpp
@@ -452,8 +452,12 @@ int Input::execute_command()
 
   else flag = 0;
 
+  // return if command was listed above
+
   if (flag) return 0;
 
+  // check if command is added via style.h
+
   if (0) return 0;      // dummy line to enable else-if macro expansion
 
 #define CommandClass
@@ -466,6 +470,8 @@ int Input::execute_command()
 #include "style.h"
 #undef CommandClass
 
+  // unrecognized command
+
   return -1;
 }
 
diff --git a/src/modify.cpp b/src/modify.cpp
index 5f7e568cf2..6d6c85da56 100644
--- a/src/modify.cpp
+++ b/src/modify.cpp
@@ -234,7 +234,7 @@ void Modify::end_of_step()
 
 /* ----------------------------------------------------------------------
    thermo energy call only for relevant fixes
-   called by Thermo clas
+   called by Thermo class
    arg to Fix thermo() is 0, so fix will return its energy contribution
 ------------------------------------------------------------------------- */