diff --git a/psipresentation.cls b/psipresentation.cls
index 1470302..05601a6 100644
--- a/psipresentation.cls
+++ b/psipresentation.cls
@@ -264,6 +264,9 @@ BoldItalicFont = *-Bold-Italic
 % section divider
 
 \newenvironment{divider}[2]{
+  % #1 background color
+  % #2 font and logo color (white or black)
+
   \setbeamercolor{background canvas}{bg=#1}
 
   \colorlet{frametitlefont}{#2}
@@ -285,6 +288,10 @@ BoldItalicFont = *-Bold-Italic
 % colored tables
 
 \newenvironment{ctabular}[3]{
+  % #1 tabular options
+  % #2 row background color
+  % #3 header font color
+
   \newcolumntype{L}{>{\ifnumequal{\rownum}{1}{\bfseries\color{#3}}}l}
   \newcolumntype{C}{>{\ifnumequal{\rownum}{1}{\bfseries\color{#3}}}c}
   \newcolumntype{R}{>{\ifnumequal{\rownum}{1}{\bfseries\color{#3}}}r}