diff --git a/CMakeLists.txt b/CMakeLists.txt
index d2d0c7098..14f4ecf85 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,7 +13,7 @@ find_package(Qt4)
 find_package(Qwt 6)
 find_package(CBF)
 find_package(Doxygen)
-
+find_package(PNG REQUIRED)
 
 if (USE_HDF5)
 	find_package(HDF5 1.10 COMPONENTS CXX)
diff --git a/RELEASE.txt b/RELEASE.txt
index dfbd0d000..b63051c0c 100644
--- a/RELEASE.txt
+++ b/RELEASE.txt
@@ -52,6 +52,7 @@ If you have any python related questions or comments, please send them to:
 
 CONTENTS
 
+- Firmware Requirements
 - Changes in User Interface
 - New Features
 - Resolved Issues
@@ -59,6 +60,20 @@ CONTENTS
 
 
 
+Firmware Requirements
+=====================
+
+	Gotthard
+	========
+    Minimum compatible version: old one
+
+    Latest version:
+        08.02.2018 (50um and 25um Master)
+        09.02.2018 (25 um Slave): Solves bugs. 
+
+	 
+
+
 Changes in User Interface
 ========================= 
 	
diff --git a/manual/manual-main/slsDetectorInstall.tex b/manual/manual-main/slsDetectorInstall.tex
index 9928d21b4..eb57be1d6 100644
--- a/manual/manual-main/slsDetectorInstall.tex
+++ b/manual/manual-main/slsDetectorInstall.tex
@@ -34,7 +34,7 @@ MYTHEN, GOTTHARD, EIGER and JUNGFRAU.\bigskip
 detectors, data receivers (to process detector data), and the client (to control
 or monitor the system). The client and data receivers can be embedded in
 the user's acquisitions system. Furthermore, the package also provides some
-tools for detector calibration.\bigskip
+tools for detector calibration.
 
 \subsection{Binaries}
 \noindent The complete software package is composed of several programs which
diff --git a/slsDetectorGui/CMakeLists.txt b/slsDetectorGui/CMakeLists.txt
index 93742edd6..55c68ca60 100644
--- a/slsDetectorGui/CMakeLists.txt
+++ b/slsDetectorGui/CMakeLists.txt
@@ -119,7 +119,7 @@ target_link_libraries(slsDetectorGui
     pthread
     zmq
     rt
-#    png
+    png
     z
     Qt4::QtOpenGL
     Qt4::QtSvg