diff --git a/src/org/geometerplus/zlibrary/text/model/CachedCharStorage.java b/src/org/geometerplus/zlibrary/text/model/CachedCharStorage.java
index 19862ab48..645458230 100644
--- a/src/org/geometerplus/zlibrary/text/model/CachedCharStorage.java
+++ b/src/org/geometerplus/zlibrary/text/model/CachedCharStorage.java
@@ -55,7 +55,7 @@ public final class CachedCharStorage {
 				File file = new File(fileName(index));
 				int size = (int)file.length();
 				if (size < 0) {
-					throw new CachedCharStorageException("Error during reading " + fileName(index));
+					throw new CachedCharStorageException("Error during reading " + fileName(index) + "; size = " + size);
 				}
 				block = new char[size / 2];
 				InputStreamReader reader =
@@ -63,12 +63,13 @@ public final class CachedCharStorage {
 						new FileInputStream(file),
 						"UTF-16LE"
 					);
-				if (reader.read(block) != block.length) {
-					throw new CachedCharStorageException("Error during reading " + fileName(index));
+				final int rd = reader.read(block);
+				if (rd != block.length) {
+					throw new CachedCharStorageException("Error during reading " + fileName(index) + "; " + rd + " != " + block.length);
 				}
 				reader.close();
 			} catch (IOException e) {
-				throw new CachedCharStorageException("Error during reading " + fileName(index));
+				throw new CachedCharStorageException("Error during reading " + fileName(index), e);
 			}
 			myArray.set(index, new WeakReference<char[]>(block));
 		}
diff --git a/src/org/geometerplus/zlibrary/text/model/CachedCharStorageException.java b/src/org/geometerplus/zlibrary/text/model/CachedCharStorageException.java
index 1f33c4a24..df5a3d7ad 100644
--- a/src/org/geometerplus/zlibrary/text/model/CachedCharStorageException.java
+++ b/src/org/geometerplus/zlibrary/text/model/CachedCharStorageException.java
@@ -25,4 +25,8 @@ public final class CachedCharStorageException extends RuntimeException {
 	public CachedCharStorageException(String message) {
 		super(message);
 	}
+
+	public CachedCharStorageException(String message, Throwable cause) {
+		super(message, cause);
+	}
 }