diff --git a/modules/odm_georef/src/Georef.cpp b/modules/odm_georef/src/Georef.cpp
old mode 100755
new mode 100644
index 00bf60c9..01764ebb
--- a/modules/odm_georef/src/Georef.cpp
+++ b/modules/odm_georef/src/Georef.cpp
@@ -683,9 +683,11 @@ void Georef::readGCPs()
     {
         std::istringstream istr(gcpString);
         GeorefGCP gcp;
-//        if ( ! gcpString[0] || gcpString[0] == '#' ) {      /* skip comments */
-//TODO skip empty lines too
-        if ( istr.peek() == '#' || istr.peek() == '\r' || istr.peek() == '\n' ) {      /* skip comments */
+      
+        if ( gcpString.empty() )  {
+            continue;
+        }
+        if ( istr.peek() == '#' ) {                         /* skip comments */
             continue; 
         }
         gcp.extractGCP(istr);
diff --git a/modules/odm_georef/src/Georef.hpp b/modules/odm_georef/src/Georef.hpp
old mode 100755
new mode 100644
diff --git a/odm_docker_readme.txt b/odm_docker_readme.txt
index a3b18734..4bbff4cc 100644
--- a/odm_docker_readme.txt
+++ b/odm_docker_readme.txt
@@ -1,11 +1,14 @@
 #ODM 0.3.1 under Debian 8.10 jessie  - 2018-02-27 by yjmenezes
 #https://github.com/OpenDroneMap/OpenDroneMap/wiki/Docker
-git clone https://github.com/OpenDroneMap/OpenDroneMap.git
+#git clone https://github.com/OpenDroneMap/OpenDroneMap.git
+git clone https://github.com/yjmenezes/OpenDroneMap.git
 cd OpenDroneMap
+# list images
+docker images
 #remove old my_odm_image if necessary
-docker rmi my_odm_image
+docker rmi my_odm_image 
 #build a fresh one
-docker build -t my_odm_image
+docker build -t my_odm_image . 
 #run tests with supplied image set. 
 #Mapped host directories for output. -v host_path:container_path
 cd tests/test_data/
diff --git a/tests/test_data/gcp_list.txt b/tests/test_data/gcp_list.txt
index 2d61198a..2065dc1a 100644
--- a/tests/test_data/gcp_list.txt
+++ b/tests/test_data/gcp_list.txt
@@ -8,7 +8,8 @@ EPSG:32617
 274914.738    4603349.014    400    1268.023    31.309    DJI_0104.JPG    HV01
 #274914.738   4603349.014    400    1350.499 -1506.619    1JI_0076.JPG badHV01
 274914.738    4603349.014    400    1350.499  1506.619    1JI_0076.JPG    HV01
-# this is a comment, skip
+# this is a comment, skip and skip empty line
+
 # GCP02, no idGCP ( old format )
 274915.887    4603307.715    400    1276.695  1043.561    DJI_0068.JPG
 274915.887    4603307.715    400     750.239    81.604    DJI_0104.JPG