diff --git a/debug/hough_opencv.py b/debug/hough_opencv.py
index 619dda8..79140f8 100644
--- a/debug/hough_opencv.py
+++ b/debug/hough_opencv.py
@@ -1,7 +1,7 @@
 """
 usage: python hough_opencv.py file.png
 
-find lines present in an image using opencv's hough transform.
+finds lines present in an image using opencv's hough transform.
 """
 
 import sys
diff --git a/debug/hough_skimage.py b/debug/hough_skimage.py
index de0f67e..93012fc 100644
--- a/debug/hough_skimage.py
+++ b/debug/hough_skimage.py
@@ -1,7 +1,7 @@
 """
 usage: python hough_skimage.py file.png
 
-find lines present in an image using scikit-image's hough transform.
+finds lines present in an image using scikit-image's hough transform.
 """
 
 import sys
diff --git a/debug/houghp_skimage.py b/debug/houghp_skimage.py
index b1680d2..c7b9aec 100644
--- a/debug/houghp_skimage.py
+++ b/debug/houghp_skimage.py
@@ -1,7 +1,7 @@
 """
 usage: python hough_prob.py file.png
 
-find lines present in an image using scikit-image's hough transform.
+finds lines present in an image using scikit-image's hough transform.
 """
 
 import sys
diff --git a/debug/morph_transform.py b/debug/morph_transform.py
index 98c6563..74145ad 100644
--- a/debug/morph_transform.py
+++ b/debug/morph_transform.py
@@ -1,7 +1,7 @@
 """
 usage: python morph_transform.py file.png
 
-find lines present in an image using opencv's morph transform.
+finds lines present in an image using opencv's morph transform.
 """
 
 import sys
diff --git a/debug/plot_geo.py b/debug/plot_geo.py
index a0216b4..3f7aaf9 100644
--- a/debug/plot_geo.py
+++ b/debug/plot_geo.py
@@ -2,7 +2,7 @@
 usage:  python plot_geo.py file.pdf
         python plot_geo.py file.pdf file.png
 
-print lines and rectangles present in a pdf file.
+prints lines and rectangles present in a pdf file.
 """
 
 import sys